Research on the Influence of Printing Pressure and Speed on Print Quality of Coated Paper

2013 ◽  
Vol 663 ◽  
pp. 286-290
Author(s):  
Ying Li ◽  
Wen Juan Gu ◽  
Bang Gui He
Keyword(s):  
Quantitative Analysis ◽  
Layer Thickness ◽  
Laser Scanning ◽  
Confocal Microscope ◽  
Print Quality ◽  
Coated Paper ◽  
Laser Scanning Confocal Microscope ◽  
Paper Surface ◽  
Printing Speed

What happens in the paper surface about ink absorption is of great important for appearance of final printing. The aim of this experiment was to investigate the influence of printing pressure and printing speed on ink layer thickness transferred onto coated paper through quantitative analysis by laser scanning confocal microscope (LSCM). Meanwhile, the influence of printing pressure and printing speed on print density and print gloss were obtained. The results implied that higher printing pressure resulted in higher ink layer thickness, print density and print gloss when printing pressure is less than 700N, but higher printing speed resulted in lower ink layer thickness, print density and print gloss when printing pressure is constant. It could be concluded that the coated paper with high printing speed compared with low printing speed resulted in lower ink absorption, lower print density, lower print gloss and worse printability on the condition of same printing pressure.

Investigation into the Influence of Coating Speed on Ink Penetration

2013 ◽  
Vol 699 ◽  
pp. 432-435
Author(s):  
Ying Li ◽  
Wen Juan Gu ◽  
Bang Gui He
Keyword(s):  
Quantitative Analysis ◽  
Penetration Depth ◽  
Surface Properties ◽  
Laser Scanning ◽  
Confocal Microscope ◽  
Coated Paper ◽  
Laser Scanning Confocal Microscope

The penetration of ink into the paper affects the final appearance of printing and the amount of ink usage. The main aim of this experiment was to investigate the efficiency of coating speed on surface properties and ink penetration and to characterize the penetration depth through quantitative analysis by laser scanning confocal microscope (LSCM). The results indicated that the surface properties of coated paper could be adjusted and improved by increasing the coating speed. With the increasing of coating speed, ink penetration depth declined and ink penetration uniformity increased. It could be concluded that the coated paper with high coating speed compared with low coating speed resulted in lower ink usage and better printability on the condition of same print density.

Study on the Effect of Coating Solid on Ink Penetration of Coated Paper

2013 ◽  
Vol 663 ◽  
pp. 282-285
Author(s):  
Ying Li ◽  
Wen Juan Gu ◽  
Bang Gui He ◽  
Bei Hai He
Keyword(s):  
Quantitative Analysis ◽  
Penetration Depth ◽  
Surface Properties ◽  
Laser Scanning ◽  
Confocal Microscope ◽  
Coated Paper ◽  
Laser Scanning Confocal Microscope

The objective of this experiment was to investigate the influence of coating solid on surface properties and ink penetration and to characterize the penetration depth through quantitative analysis by laser scanning confocal microscope (LSCM). Fluorescent ink was used to observe and characterize ink penetration and distribution by LSCM. The results implied that the surface properties of coated paper could be adjusted and improved by increasing the coating solid. With the increasing of coating solid, ink penetration depth declined and ink penetration uniformity increased. It could be concluded that the coated paper with high coating solid compared with low coating solid resulted in lower ink usage and better printability on the condition of same print density.

Investigation into the Effect of Coating Thickness on Ink Penetration by LSCM

2010 ◽  
Vol 174 ◽  
pp. 350-353
Author(s):  
Ying Li ◽  
Bei Hai He
Keyword(s):  
Quantitative Analysis ◽  
Penetration Depth ◽  
Coating Thickness ◽  
Laser Scanning ◽  
Three Dimensional ◽  
Accurate Method ◽  
Print Quality ◽  
Laser Scanning Confocal Microscope ◽  
Measurement Result ◽  
Distribution Uniformity

Cutting is a relative accurate method in the literatures about ink penetration measurement at present. But cutting may bring some damages to paper, which reduces reliability of measurement result. The objective of this experiment was to investigate the influence of coating thickness on ink penetration and characterize the penetration depth through quantitative analysis by Laser Scanning Confocal Microscope (LSCM). Fluorescent ink was used to observe and characterize ink penetration by LSCM. Three-dimensional images of ink pigment penetration were obtained by reconstructing all XY plane images. The results implied that it was reliable and effective method using LSCM to characterize the ink penetration depth and distribution uniformity. It could be concluded that the print quality could be adjusted and improved by increasing the coating thickness.

Use of confocal laser scanning microscopy and a computer model to understand ink cavitation and filamentation

TAPPI Journal ◽  
2010 ◽  
Vol 9 (10) ◽  
pp. 7-15
Author(s):  
HANNA KOIVULA ◽  
DOUGLAS BOUSFIELD ◽  
MARTTI TOIVAKKA
Keyword(s):  
Laser Scanning ◽  
Confocal Laser Scanning Microscope ◽  
Laser Scanning Microscopy ◽  
Confocal Laser Scanning ◽  
Confocal Laser ◽  
Print Quality ◽  
Length Scale ◽  
Offset Printing ◽  
Significant Difference ◽  
Printing Speed

In the offset printing process, ink film splitting has an important impact on formation of ink filaments. The filament size and its distribution influence the leveling of ink and hence affect ink setting and the print quality. However, ink filaments are difficult to image due to their short lifetime and fine length scale. Due to this difficulty, limited work has been reported on the parameters that influence filament size and methods to characterize it. We imaged ink filament remains and quantified some of their characteristics by changing printing speed, ink amount, and fountain solution type. Printed samples were prepared using a laboratory printability tester with varying ink levels and operating settings. Rhodamine B dye was incorporated into fountain solutions to aid in the detection of the filaments. The prints were then imaged with a confocal laser scanning microscope (CLSM) and images were further analyzed for their surface topography. Modeling of the pressure pulses in the printing nip was included to better understand the mechanism of filament formation and the origin of filament length scale. Printing speed and ink amount changed the size distribution of the observed filament remains. There was no significant difference between fountain solutions with or without isopropyl alcohol on the observed patterns of the filament remains.

A video rate laser scanning confocal microscope

2008 ◽  
Author(s):  
Hongzhou Ma ◽  
James Jiang ◽  
Hongwu Ren ◽  
Alex E. Cable
Keyword(s):  
Laser Scanning ◽  
Confocal Microscope ◽  
Laser Scanning Confocal Microscope

scholarly journals Plasmon resonance and the imaging of metal-impregnated neurons with the laser scanning confocal microscope

eLife ◽  
2015 ◽  
Vol 4 ◽  
Author(s):  
Karen J Thompson ◽  
Cynthia M Harley ◽  
Grant M Barthel ◽  
Mark A Sanders ◽  
Karen A Mesce
Keyword(s):  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Laser Scanning ◽  
Energy State ◽  
Confocal Microscope ◽  
Fluorescent Imaging ◽  
Cell Labeling ◽  
Resolving Power ◽  
Noble Metal Nanoparticles ◽  
Laser Scanning Confocal Microscope

The staining of neurons with silver began in the 1800s, but until now the great resolving power of the laser scanning confocal microscope has not been utilized to capture the in-focus and three-dimensional cytoarchitecture of metal-impregnated cells. Here, we demonstrate how spectral confocal microscopy, typically reserved for fluorescent imaging, can be used to visualize metal-labeled tissues. This imaging does not involve the reflectance of metal particles, but rather the excitation of silver (or gold) nanoparticles and their putative surface plasmon resonance. To induce such resonance, silver or gold particles were excited with visible-wavelength laser lines (561 or 640 nm), and the maximal emission signal was collected at a shorter wavelength (i.e., higher energy state). Because the surface plasmon resonances of noble metal nanoparticles offer a superior optical signal and do not photobleach, our novel protocol holds enormous promise of a rebirth and further development of silver- and gold-based cell labeling protocols.

Measurement characteristics analysis and test of 3D laser scanning confocal microscope

2018 ◽  
Vol 47 (8) ◽  
pp. 817005
Author(s):  
崔建军 Cui Jianjun ◽  
杜 华 Du Hua ◽  
朱小平 Zhu Xiaoping ◽  
薛 梓 Xue Zi ◽  
闫勇刚 Yan Yonggang ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Confocal Microscope ◽  
3D Laser Scanning ◽  
Laser Scanning Confocal Microscope ◽  
Characteristics Analysis

Edge enhancement of weak-phase object in laser scanning confocal microscope

2005 ◽  
Author(s):  
Masahide Itoh ◽  
Shin Uematsu ◽  
Hiroshi Ishiwata ◽  
Toyohiko Yatagai
Keyword(s):  
Laser Scanning ◽  
Confocal Microscope ◽  
Edge Enhancement ◽  
Phase Object ◽  
Laser Scanning Confocal Microscope ◽  
Weak Phase

Study on the Ink Penetration Behavior of the Offset Paper Surface

2010 ◽  
Vol 174 ◽  
pp. 354-357
Author(s):  
Xiao Lin Zhang ◽  
Ru Min Wang
Keyword(s):  
Penetration Depth ◽  
Important Influence ◽  
Color Intensity ◽  
Paper Surface ◽  
Penetration Behavior ◽  
Ink Transfer ◽  
Printing Speed

In the offset process, ink penetration performance has extremely important influence on the quality of printed products. Ink penetration behavior and ink transfer volume on the offset paper surface were researched with the aid of IGT printability tester (AIC2-5) in the conditions of temperature 20±3°C and humidity of 60 ± 5%. Effect of different printing pressure and printing speed on the ink penetration depth was discussed, and at the same time, the depth was measured by GX71 Inverted Metallurgical Microscope. The results showed that, with the increasing of printing pressure, the changes of ink penetration depth and the ink transfer volume on offset paper surface were increased firstly and then decreased. When printing pressure was 400N, the ink penetration depth reached the maximum 71.67μm and the ink transfer volume reached the maximum too. With the enhancing of printing speed, ink penetration depth and ink transfer volume would be decreased gradually. The study also found that ink penetration behavior had certain influence on the ink color forming properties. For the offset paper used in this experiment, when ink penetration depth was 60.0μm~63.0μm, the print had high ink color intensity and color efficiency. When the ink penetration depth was too deep, ink color intensity and color efficiency was significantly reduced, while the color hue error would be increased, the print ink color turned shallow.

Sign in / Sign up

Export Citation Format

Share Document